diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index a20967b..c7e6d60 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -50,7 +50,14 @@ jobs:
         CIBW_ARCHS_LINUX: ${{ matrix.arch }}
         CIBW_BUILD: "cp312-* cp313-*"
         CIBW_SKIP: "*-musllinux*"
-        CIBW_TEST_COMMAND: "python -c 'import pylibbpf; print(f\"pylibbpf {pylibbpf.__version__} imported successfully\")'"
+        CIBW_TEST_COMMAND: >
+          python -c "
+          import pylibbpf;
+          assert hasattr(pylibbpf, 'BpfObject'), 'BpfObject not found - extension failed to build';
+          assert hasattr(pylibbpf, 'BpfMap'), 'BpfMap not found';
+          print(f'pylibbpf {pylibbpf.__version__} with {len(dir(pylibbpf))} members');
+          print('Available:', [x for x in dir(pylibbpf) if not x.startswith('_')])
+          "
         CIBW_TEST_SKIP: "*-linux_aarch64"
 
         CIBW_MANYLINUX_X86_64_IMAGE: manylinux_2_28